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history of aviation

...in pushing speeds upward. During the 1920s the Curtiss company built a remarkable series of high-speed racing biplanes for the U.S. Army Air Corps and Navy. These were powered by the innovative
D-12, a 12-cylinder liquid-cooled engine, also of Curtiss design, that set international standards for speed and streamlining. One of the Curtiss planes, an R3C-2 piloted by Lieut. James Doolittle,...

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